Mayor of London Sadiq Khan said: "The situation in London is now critical with the spread of the virus out of control.
"The stark reality is that we will run out of beds for patients in the next couple of weeks unless the spread of the virus slows down drastically."
BREAKING: London has declared a “major incident” as the surge in COVID cases threatens to overwhelm the NHS in the capital.
There are now 35% more COVID patients in London hospitals than at the peak of the April wave. @LBC
Just yesterday, NHS leaders had warned London hospitals could be overwhelmed by Covid-19, even if Nightingale hospitals reopen.